fick·le /ˈfɪkəl/
  (a.)變幻無常的,浮燥的,薄情的
  Fic·kle a.  Not fixed or firm; liable to change; unstable; of a changeable mind; not firm in opinion or purpose; inconstant; capricious; as, Fortune's fickle wheel.
     They know how fickle common lovers are.   --Dryden.
  Syn: -- Wavering; irresolute; unsettled; vacillating; unstable; inconsonant; unsteady; variable; mutable; changeful; capricious; veering; shifting.
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  fickle
       adj 1: marked by erratic changeableness in affections or
              attachments; "fickle friends"; "a flirt's volatile
              affections" [syn: volatile]
       2: liable to sudden unpredictable change; "erratic behavior";
          "fickle weather"; "mercurial twists of temperament"; "a
          quicksilver character, cool and willful at one moment,
          utterly fragile the next" [syn: erratic, mercurial, quicksilver(a)]